Help to diagnose this behavior

[richiesgr]

Hi

I've get a seiko bellmatic caliber 4006A. This watch have been severely treated with someone I suspect have used some WD40 the liquid have somehow solidify with the time leaving a sticky residue like glue. The hair spring was sticky too.

I know that the pre cleaning and cleaning will be a very long process to rid off all this WD40.  

• I've pre-clean manually in lighter fluid each part and keep the palet fork and complete balance 24 hour in dip fluid. 
• Inspect each part under microscope to check for any rust point or broken jewel or broken teeth 
• polish every pivot using EVE sticks 
• make a clean using ultrasonic bath using ELMA1-9 red at 40 degree temperature
• 2 rinse with distilled water 
• 1 rinse in IPA alcohol 

I reassemble and properly oiled the watch. And voila !! the watch was working.

But my joy was for short time I leave the watch on the time grapher for few minutes and great amplitude 233 degree good keeping time after simple regulation.

Now after some time I would say 10-15 minutes the watch slowed down almost dead the grapher couldn't pick anymore a reading. I took the watch in hand flip in flip out the watch restart as normal. then again after 10-15 minutes on the grapher the watch slow down and just stopped.

I agree I took may be a difficult watch for a beginner like me but I loved the watch.

Could you help me to pinpoint where should I look ?

Thanks 

[watchweasol]

Hi I should go back over the cleaning routine and make a close inspection of the jewels and pivots for deposits and the same for the balance, make sure ther are no deposits left causing problems.

[Nucejoe]

Did you check the mainspring?        Replaced it with new? 

Manually wind through the ratchet wheel ?   

 Ratchet screw is pretty weak in 4006, but couple turns wouldn't put up much resistance.

Rgds

 

[Klassiker]

Can you please clarify what you mean by "flip in flip out" which got the watch running again?

[mikepilk]

Is there much play in the bridge at the top of the barrel arbor ?

Are the teeth on the barrel clean, and undamaged?

[richiesgr]

Thanks for all your advise.

I've disassembled the balance and reclean the upper cap jewels and the the staff pivots and no more error working fine 

Thanks a lot